A little bash function for parsing through multipath -ll output.

mll is for multipath listing

#!/bin/bash

function mll {
  local inputfile search_cmd
  # If directory, assume sosreport and look for multipath output
  if [[ -d $1 ]]; then
    inputfile=$1/sos_commands/devicemapper/multipath_-v4_-ll
    [[ -r $inputfile ]] || { echo -e "'$inputfile' unreadable\nRun with no args to see usage"; return 2; }
  elif [[ -f $1 && -r $1 ]]; then
    inputfile=$1
  else
    echo "Arg 1: must be file containing 'multipath -ll' output or dir-root of sosreport"
    echo "Arg 2 (optional): should be a wwid, friendly name, or LUN identifier to search for"
    return 1
  fi
  # If 1 arg only, use cat to process output
  # Otherwise, search for second arg in output
  [[ $# == 1 ]] && search_cmd=cat || search_cmd="awk -vRS=\n\n /$2/"
  awk '
    /^[[:graph:]]+ \([[:alnum:][:punct:]]+\) *dm-/
    /^[[:graph:]]+ *dm-/
    /^\[?size=/
    /(\\_|\|-|`-)/
  ' "$inputfile" | sed '1!s,^[[:alnum:]].*dm-,\n&,' | $search_cmd
}

Usage example:

[rsaw:zarch]$ mll multipathfun-sosreport/ mpath11
mpath11 (123456789000000000000000000000000) dm-13 IBM,2145
[size=50G][features=1 queue_if_no_path][hwhandler=0][rw]
\_ round-robin 0 [prio=20][active]
 \_ 3:0:4:3 sds 65:32  [active][ready]
 \_ 3:0:5:3 sdw 65:96  [active][ready]